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<html lang="zh-cn">
  <head>
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    <meta charset="utf-8">
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    <title>Hello, world!</title>
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  <body>
    <div class="container" style="height: 100px;background-color: red;">
      流式容器
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    <div class="container-fluid" style="height: 100px;margin-top: 100px;background-color: blue;">
      固定容器
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      自定义容器
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